metso automation kajaaniMCAi, Инструкция по установке, эксплуатации и обслуживанию

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kajaaniMCA i – Installation, Operating & Service
- 9.9 -
W4610201 V2.5 EN
The MCAi is less sensitive to fillers than to fibers. In
practice the sensor measured slightly over a half of a
change in filler content. Table 9.3 illustrates the sen-
sor’s sensitivity to different fillers relative to its sensi-
tivity to fibers.
Table 9.3. Sensitivity of MCAi to different fillers.
Filler MCAi sensitivity
Kaolin 0.61
CaCO
3
0.47
Talc 0.7
TiO
2
0.1
Example: at 3% process consistency the filler con-
tent (100% kaolin) changes by 10 % points, which
corresponds to 0.3% Cs. The MCAi sees this as a (0.61
x 0.3 %) = 0.18 % change, and thus the error will be
0.12%.
The filler content information can be connected to
the isolated analog input Ain1 (on Field Connection
Board) as either a current or voltage signal. If a current
signal will be used, it must be converted into a voltage
by connecting a resistor across the positive and negative
poles of analog input Ain1. The voltage is then derived
from the formula:
U = R x I
where R = resistance and I = current signal value.
Scale the voltage into a filler content value as follows:
1. Go from M
AIN
M
ENU
=> S
ELFDIAGNOSTICS
=> S
PE
-
CIAL FUNCTIONS
=> F
ILLER CONTENTS
:
ANALOG INPUT
(Fig. 9.13).
2. Press [F1&F2] E
DIT
and then type the voltage signal
value and the corresponding filler content for the
low and high limits. You can also increase the
filtering if necessary.
3. Press [F3&F4] S
AVE
. The MCAi will prompt:
“Change scaling of the filler contents?” Press Y
ES
and the MCAi will correct the measured consistency
according to the entered filler content.
Filler content correction can be deactivated and
activated by pressing [F7&F8] T
URN OFF
and [F7&F8]
T
AKE INTO USE
.
F 7 F 6
F 5
F 4 F 8 F 3
F 1
F 2
F 9 F 1 0 F 1 1 F 1 2 F 1 3 F 1 4
F 1 5 F 1 6
i
Fig. 9.13. “Filler contents” display.
FILLER CONTENTS
Connect filler contents signal to the
analog input Ain1.
Low limit High limit
0.00 V= 0.0 % 5.00 V= 0.0 %
Filtering
= 1.0 s
Filler contents:
0.000 V = 0.0 % Not in use
Edit Take into
use
9.E. Filler Correction through Analog Input